Which of the following is NOT a component of DNA?
a. thymine
b. phosphate
c. adenine
d. ribose
e. guanine
ANSWER: d
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Encapsulated yeast is identified in the cerebrospinal fluid (CSF) of a patient with AIDS. The most likely stain or reagent used to identify this organism is:
a. potassium hydroxide (KOH). b. calcofluor white. c. lactophenol cotton blue. d. India ink.
Which of the following traits is not characteristic of amphibians?
a. carnivorous as adults b. four-chambered heart c. needing water to breed d. evolved from lobe-finned fish
Why are toxins more concentrated in sediments than in the overlying water column?
What will be an ideal response?
The mechanism that causes a vine’s tendrils to grow around an object, such as a wire fenceline, is called ____
a. thigmotropism b. phototropism c. gravitropism d. vernalization e. photoperiodism